6mm Creedmoore vs. 6mm SLR

[SHootSTraight22]

Reloader 26 will do it but we've already gone over speed limits and such....

I need to pick up some of this RL26... I have RL19 and RL22... Oh, I forgot the oldy but goody RL12, that stuff will impress any Palma shooter with 155gr bullets... I have mostly slower powders due to my 7mm STW that I originally started handloading for.. But I'm getting well stocked now on Varget and H4350... Enough of the small talk,,, how temp. stable is RL26 between 100F and "say" 50F??? I ask this because you all the time here Reloader Powders are sensitive but I've seen one guy around here that swears RL17 isn't as sensitive as others claim, "at least between temps of 100F to 55F" or 40F degree swings... What I'm wondering is if certain powders "maybe temp sensitive" but "only between certain temps "not extremes???" Like say between 40F and 0F... Other words it maybe "seasonally unstable" but shoots "great" within temp slides of a normal season "single" season... For example, we maybe over looking a powder because after putting the loaded cases in the freezer and shooting them we notice huge changes on impact, but what we may not know is if we increase the powders temp just 10F degrees above freezing the rounds or powder may shoot just like it would at 90F... The powder may have a certain window/or point "between 40F and 30F" that the sensitivity "change" occurs at, so it would be fine to use during a summer match between 100F and 60F...???? It's a whole another subject but I can't help but wonder if we handicap or limit ourselves by not actually trying a certain powder within the temps of our match because a certain powder shows changes below or at freezing based on someones/ours alone tests... I say this thinking of RL17 and the benefits of it's velocity... Plus, I say this thinking about how hard certain powders are to get an I'm sure people almost cry over.. We maybe stressing over nothing when considering at normal/average shooting temperature changes certain powders maybe stable but only show changes down to a certain point.. That point maybe below/at freezing and by carrying a cooler in the field/range (most people use the ice pack method to test) we are causing the powder to drop below it's stable window thinking that the test results would show equal/or near the same change at 10-15F degrees warmer..??

 

[Rtheurer]

I am going to for go the thought of trying to buy points for the lack of skill on learning to read wind and trying to get a leg up on fellow shooters.

The meat and potatoes of the question minus all the gamesmanship is 6mm Creed or 6SLR for a case to run a 105 class bullet at 3200fps +

I went back and looked at some of my notes on loading the 6SLR. I have tried a lot of powders or at least gave them a quick try to see what would work. Sometimes just to see what kind of Velocity and Pressure I could get. One of the powders I looked at was Retumbo

Looking at Pressure and Velocity when testing. Here is a few that I got to test before work got in the way.
Winchester cases, Tula Primer, 105Hyb 22 thou off the lands.

Control Group.
Powder Velocity PSI ES
H4831 SC 43.52 3006 @ 56,022 18
H4831 SC 43.50 3019 @ 54,179 33

Retumbo 49.50gr 3208 @ 63,299 26 ( Note on test. Compressed with late ignition on 3 of 5 shots)
Retumbo 50.02gr 3229 @ 64,902 18 ( Note on test. Very Compressed, Late ignition on 5 of 10 shots,
.75 Milisecond later in pressure curve.) Loose pockets and leaking.

H1000 47.12 3086 @ 58,131 36 ( note on test, Good Fill Ratio, good Accuracy, high ES )

Only One shot each on the N160.

N160 44.02 3184 @ 69,477 ( Note on test Flat Primer, almost pierced)
N160 44.24 3190 @ 72,909 ( note on test, Blown Primer)
N160 44.42gr 3203 @ 71,519 PSI ( Blown Primer Brass Ruined)


Russ T

Thanks for the info! Do you have any data for H4350!! I'm interested in where the ejector marks start showing while doing a load work up with H4350.. I'm trying to see how much difference the greater case capacity makes compared to a 6mm Creed or 6mm Lapua... That in it's self will show the superiority of Lapua small primer cases because the little 6mm Lapua hits 3,150fps with no problem.. The 6mm Creed shoots there easily with some tweeking to the system, so it just makes scents that the 6SLR will do better given case capacity... I'm interested in how much better and how much is gained by this increase in capacity?? In other words is the increase in capacity just a waste of space and the 105gr hybrid won't hit a node around 3,200fps???....

I think what your missing is the ability of smaller cases to produce higher velocity because it is more efficient than the larger cases. The best example is the 6mm Dasher. 34gr of powder with speeds of much much larger cases. More capacity sometimes is not better.
Have not tested 4350 on pressure testing equipment yet. These are actual test results and not estimates or guess's

Russel.

PS I think you would have had better luck with this thread had you just asked about the case and its performance... leaving out the other PRS stuff. ( Just an observation)

 

[MOShooter]

There's info about RL 23 & 26 on this site if you search for them. The only experience I have is when I tested up to 46.9g. First day out it was ok. My next trip to the range was a hot day and the rounds set in the sun for about 5 mins and I only shot 1 because the bolt lift was heavy and had extractor marks on the brass. Too close for me. That load was running 3150 in a 24" tube.

 

[25wsm]

I love the 6slr. I shot it at the world open 2 yrs ago with rl23 and 105 hybrids @ 3175. I got second place overall for light/heavy gun. Now I run rl26 and it will push a 105 up to 3400 in a 29 inch barrel. I shoot 28 inch barrels now and get 108 Berbers to 3325. That's my node. It works all yr because I keep my ammo at the same temp all season. Shep

 

[74Bronco]

As others have noted the 6slr will do what your asking and without using the small primer brass, the slr has a slight advantage over the 6 creed in case capacity and would be the better choice. r26 will easily get you there but is pretty temp unstable at temps above 80° f,
in my 6slr ive pushed the 105 hybrids to over 3350 with no pressure signs (doesnt mean i wasnt overpressured) and the 115vldh over 3250 with r26. it wears a 27.5" kreiger .236 4 groove 7.5 twist by the way. my happy and ez on brass load is 47.6gr h1000 under the 115vldh .010 into the lands, 3100fps at 200 ft elevation, br2 primer, 2.90-2.91coal depending on bullet lot numbers. when u look at the external ballistics of my 115 load compared to a 105 hybrid at 3150 the difference is so small most shooters couldnt shoot the difference in prs. 105 @1000 with 200 yrd zero = 233.2 inches or 22.3moa and 61.4 inches of drift in a 10mph 90° wind. 115@1000 with 200 yrd zero = 235.8" or 22.5 moa and 59.9" of drift. now to compare the 105 hybrid at 3230 , same zero= 220" or 21.1 moa and 58.9" of drift by driving the 105 to 3230 you only gained 2.5" of drift@ 1000 and if you can consistently shoot better then 1/4 moa your a better man then me or most and might actually be able to cheat a point or 2.

btw run the numbers on the sierra 110 mk at 3100 or 3150. if you got a barrel that likes them you will clearly see no advantage of the 105 at 3230 and breaking speed rules.

 

[Capt. Oblivious]

Ill also jump on this old one, I have had my one 28” SLR over 3300fps with 105s without any problems but I knew the preausre could not be at “normal” levels. At that speed it would group pretty well but I dialed it down to just about 3170fps and it hammers anything I point that barrel at. If i need to up my ballistics id rather shoot a 115gr Dtac at a “normal” speed than drive the rifle or current load harder

 

[jfjohn77]

I wonder if the OP is still alive? He hasn't been on this site since Mar of 2016. ???

 

[Capt. Oblivious]

Maybe he bought a 6.5creed

 

[jfjohn77]

I have to admit, I have a 6.5 Creed, 2 of them actually, one I built on an A10. Can't complain about it... Shoots great and now that Lapua makes the small primer brass, best of both worlds. That's why I am thinking about the 6mm Creed. Always looking for something else. I have the dies, go gauge and some 1x fired brass for a 6SLR that I've haven'n built yet, but now I'm thinking about a 6mm Creed instead. Decisions, Decisions! I have way too many rifles and pistols, if there is such a problem? I just love to just shoot... I can just step out back, 350 yds is the max I can do here. The wife doesn't complain about the firearms or the shootin'... sometimes she is right beside me. I guess I need to take advantage of it while I can!

 

[jfjohn77]

Just wondering if the Lapua Creed brass can handle the pressure that the 6.5x47L has a reputation of? I sure like my 22x47L. Was also considering a 6x47L for that reason, but seems several shooters are have issues with that cartridge.