Need opinions! to hot of load?

[fm1947]

I am shooting a savage F class gun in 6mm br, I found a load on 6mm BR website I wanted to try was listed by one of the world record shooters (forgot his name) 30gr varget with 107 SMK .005 or .010 out of lands he said it would run 2850 he was right got 2854 out of it and good groups at 600 yards 3.1 inch but raiseing bolt handle after fireing was really tight to eject case, what do you think , to hot for my factory gun?

 

[Steve Blair]

That is a classic accuracy load and should produce reasonable pressures in almost any 6BR. In this case, reduce the charge by 5% (i.e.: 1.5 grains) and work up. You will likely find a load that shoots very well in your rifle.

 

[Kenny474]

Sleepygator is right, you need to reduce the load a little and work up. Anytime you use a recipe that is close to max you need to reduce by at least 5% before even trying it in your rifle. Every rifle is different and some build higher pressure than others. By starting low and working up you reduce the risk of having a pressure related failure of some kind.

If you had worked up slowly you would have noticed pressure signs developing, instead of immediately having hard bolt lift. While nothing bad happened, it could have been much worse, which is why you need to start low.

 

[HPMike800]

Yes, hard bolt lift is an indicator that the load is over pressure. I'm sure it will shoot just as good at 2780-2800fps and your brass will last a lot longer.

 

[fm1947]

okay over whelming responce and as i thought to hot for my gun shot 3 loads yesterday 28.2, 29.1 and 30, the 30 was best results only by .2 or so inch about 3.3 and 3.4 the 28.2 was effortless is raising bolt so was 29.1 I have a match to shoot in the morning so guess I will go with 29.1 sure am glad I wrote down scope setting for each load going from 28.2 to 30gr was 14 inch high.

Thanks a bunch was hoping to get early responce before loading for tomorrow, Thanks to all of you again!

 

[Kenny474]

You need to do load work-up in smaller intervals, like .2gr, so you can find an ideal tune. Working up 1gr at a time in such a small round is far from ideal. It will also put you overpressure very quick.

I would go and try from 29.0 to 29.8 in .2gr intervals, and then really fine tune from there.

 

[fm1947]

kenny i will try that next wk thanks good idea, range is to far to do that today , going to get ready for first 600 yard bench rest match, have shot only one other match at 600 that was F class back in july shot 284 forgot how many x seems forgetting is normal at 63 years old.

 

[fm1947]

one more question, any comparisons between the 107 SMK, 105 Berger VLD and Lapua 105 Scenar in 6mm BR, any noticable accuracy difference.

 

[Steve Blair]

My 12F liked the 107 Sierras and 105 Scenars with the edge going to the 107. I could not get the seating depth where the barrel liked it with VLDs.

 

[fdshuster]

fm1947: My Hart barreled 1-8 twist 6BR is doing great with the 107 Sierra MatchKing's, seated to touch, 30.0 grs. of Varget with the CCI450 magnum primer. No signs of pressure, proving all rifles are different. Your bore could be a little tighter than mine.

 

[fm1947]

interesting, I guess I will have to try them, thanks guys, are those magnum primers cheaper then the BR primers

 

[fdshuster]

fm1947: Just checked the boxes, and yes they are cheaper. BR4's tagged at $48.60/1000, 450's at $33.50/1000. Never was a fan of magnum primers for "standard" loads, saw the paragraph on the 6BR info page that recommends them for the heavyweight bullets in 6BR, tried them with the 107 Sierra's, and was surprised at the results, groups actually a little tighter than with the BR4's.

 

[Steve Blair]

I have also found the CCI 450 produced better results in the Lapua Palma .308 brass than any other primer. Initial testing looked like the BR4 was the way to go but it did not validate well. I had several >200 fps low rounds in loads that were 100% weighed. Changing to CCI 450s eliminated the "dropouts" and produced fine consistency, between 7-14 fps ES. All testing was with 8208 XBR and 155.5 Bergers.

 

[fm1947]

fdshuster, great i will buy them from now on $48 is hard to handle I used magnum primers in my 9mm open class uspsa gun due to large amount of powder used to make major power factor and also used then is my steel plate gun where there is no power factor alot of pistol people freak out over that but all open class shooters use magnum primers.

sleepygator, boy thats good to know i shoot 308 but have never bought the lapua palma brass with small prime do you think it makes a difference to switch if your shooting 168 gr smk, I have thought about it several times but never heard of anyone doing that other then palma shooters and 155s

 

[Steve Blair]

No Palma brass testing for any other bullets weights. My sense is that the more/slower powder, the better a large primer is likely to work. I use large primers with RL17 and Berger 210s in .308.

 

[jo191145]

fm

By all means start low and work up in small increments.
Was this by chance virgin brass you were firing? That can raise pressures quite a bit.

Just to clarify. You mentioned using magnum primers in your pistols.
If these are magnum pistol primers DON"T try them in your rifle.
Just wanted to make sure of that. I've seen it done and it ain't pretty ;D

 

[fm1947]

jo191145

no second fired and the primers were BR4 CCI, yes that day like i said i had several loads 28, 29, and 30 others were good soon I will take the 29 and go up in increments of.2, Thanks

 

[fm1947]

jo191145


http://s732.photobucket.com/albums/ww321/fjmcm_1947/My%20Guns/

the stainless is a 9mm started out as a loaded springfield, the other with c-more is a STI 9mm and the other is a 45 my house and carry gun springfield loaded gun

 

[Kenny474]

That's some seriously nice iron you have there. I have a couple 1911's, but nothing like the open class stuff you have there. My Dan Wesson 10mm is about as good as mine get, and it's definitely not an STI open pistol.

 

[fm1947]

Thanks , I have not shot pistol this year much got aggravated with my self, I am 63 retired and I am slowing down and just not shooting as good as 2 years ago won a couple matches so I started rifle a bit more relaxing for me then running and gunnin, the stainless open gun is for steel plate competition and is a single stack unlike the STI double for USPSA. I had the Stainless for sale couple months ago its loaded nothing in it is sprinfield other then slide and frame, EGW Sear and disconnect, 2 lb trigger, SVI titanium sear spring, Doug Koenig low mass hammer, SVI mag well, and Shuemann Bull Barrel, EGW Compensator Titanium, and c-more red dot.

That gun will shoot like a 22 no movement what so ever and can be loaded really light since Steel plate shooting has no power factor.

I plan to shoot USPSA when it cools down to hot right now.