6.5 Creedmoor.......Large or Small primer pocket???
- Thread starter BowChamp
- Start date
Buy BOTH large an small pocket cases. That way when you can`t find primers for one or the other, at least you`ll still be able to keep shooting being you have a selection of large and small to choose from. As it is right now though, small pocket would be my choice just because large rifle primers are very hard to get right now.
I use, Large, F-210 M Primers in Both, Lapua and Peterson, Brass with, 130 Gr ELD-M's ( Factory Stock, Tikka T-3, 24" bbl. except with, a lighter Trigger Spring ) and BOTH, cases / loads, ARE, Sub 1/2 MOA.
With, the Extreme's of Cold Weather in Idaho,. I like Hot, LARGE Primers,.. in the Winter.
And they Burn, StaBall 65 ( a Ball Powder ),. efficiently !
Our Family ( 3 of, Us guys ), "Got Lucky" and bought, 5,000 of, the Fed F-210 M's,.. a couple of, Years ago !
With, the Extreme's of Cold Weather in Idaho,. I like Hot, LARGE Primers,.. in the Winter.
And they Burn, StaBall 65 ( a Ball Powder ),. efficiently !
Our Family ( 3 of, Us guys ), "Got Lucky" and bought, 5,000 of, the Fed F-210 M's,.. a couple of, Years ago !
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CJ6
Silver $$ Contributor
Yup. In the winter I like LRMs especially with ball powders or slow powders like 565 7828 or similar.
You mentioned 1000yds, I’m assuming benchrest type shooting. Small rifle would be my suggestion mainly due to availability but as mentioned above there’s more brass in the head area. 6.5x47 Lapua is about 10% less capacity but all brass is small rifle primer and I’ve had zero issues with ignition in that cartridge. Even ball powders should ignite with a cci 450 on warm to cool days. If this rig goes hunting you can always load some once fired factory brass that has large primers if extreme cold weather might be encountered. I’ve recently switched to Peterson small primer 6.5 Creedmoor brass and it’s working great. Good luck with your new setup.
Yes sir........benchrest and maybe some prone shooting. I joined a club and now have access to 1050yd range.
I've never had this option of large or small primers with other cartridges I've loaded. As others said, availability of primers may be something to think about also. I don't think I'll have to worry to much about cold weather in Florida.
Building this rifle just to have fun shooting...no hunting with this one. This will be my first custom built rifle...always had factory builds up to this point. I'm really pumped about it for sure!!
Thanks for the advice!
Steve Donlon
Gold $$ Contributor
I see no value in the SRP brass. I know people that like the fact that they last longer but from what I have seen I get more velocity and accuracy from the LRP brass. I had to open up my flash holes on the SRP brass to make them shoot better, more velocity and accuracy. But still not as good as LRP brass.
Canuckienns
Silver $$ Contributor
Small rifle magnum primer in small primer pocket brass, anything else is out of date. Make sure your bolt is of the small primer size or get it bushed.
I was wondering if anyone had tried small rifle magnum primers and how they had worked.
Thanks!
we have a couple factory Rem 700s that we use Lapua LRP brass in just to keep from worrying about blanking a primer,,
Pros for SRP ignition:
Reduced velocity SD values with an appropriate primer/powder match.
More metal in the case-head = greater strength / longer life. (Or for some, being able to ramp up pressures / MVs to higher levels than standard large primer equivalents.)
Primer supply availability issues - can work either way of course.
Downsides:
Marginal ignition heat and brisance in Creedmoor / 308 size cases makes the SRP type:
..................... powder and primer sensitive (large MV spreads, even hang and misfires with some combinations)
..................... ambient temperature sensitive. (Cold components need more primer flame heat to reach consistent ignition temperatures.)
................... reduced MVs compared to LRP. Usually a small reduction but can be as much as 1.5gn difference in powder charge. (If using both types, loads usually need working up separately at the top end of charges.)
Then too .................. severe primer cratering and in worst cases blanking as @Eric Leonard says - a rifle, not excessive pressure, problem. I had an FN SPR (selected Win 70 pre-64 type action) I rebarrelled to 6.5X47 Lapua and had to have it rechambered to 260 Rem to return to LRP. For some reason small primers suffer this worse than large. The other answer is a bolt / firing pin job turning the pin down and fitting a bush with smaller aperture in the bolt face - wasn't an available service in the UK when I had the SPR. Affects many off the shelf factory rifles.
Finally, there can be a serious risk in transferring a 'hot' maximum load charge from SRP to equivalent LRP when both types of brass are available, where the case is weaker and the more aggressive primer increases pressures substantially.
Reduced velocity SD values with an appropriate primer/powder match.
More metal in the case-head = greater strength / longer life. (Or for some, being able to ramp up pressures / MVs to higher levels than standard large primer equivalents.)
Primer supply availability issues - can work either way of course.
Downsides:
Marginal ignition heat and brisance in Creedmoor / 308 size cases makes the SRP type:
..................... powder and primer sensitive (large MV spreads, even hang and misfires with some combinations)
..................... ambient temperature sensitive. (Cold components need more primer flame heat to reach consistent ignition temperatures.)
................... reduced MVs compared to LRP. Usually a small reduction but can be as much as 1.5gn difference in powder charge. (If using both types, loads usually need working up separately at the top end of charges.)
Then too .................. severe primer cratering and in worst cases blanking as @Eric Leonard says - a rifle, not excessive pressure, problem. I had an FN SPR (selected Win 70 pre-64 type action) I rebarrelled to 6.5X47 Lapua and had to have it rechambered to 260 Rem to return to LRP. For some reason small primers suffer this worse than large. The other answer is a bolt / firing pin job turning the pin down and fitting a bush with smaller aperture in the bolt face - wasn't an available service in the UK when I had the SPR. Affects many off the shelf factory rifles.
Finally, there can be a serious risk in transferring a 'hot' maximum load charge from SRP to equivalent LRP when both types of brass are available, where the case is weaker and the more aggressive primer increases pressures substantially.
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Get that with LRP also.
The whole more metal is over hyped as unless you are at max pressures LRP brass can get you a good amount of firings. I have brass with 10 firings on them and they are still going. If you bought 500 pieces of brass you will burn out a couple barrels before you are worrying about getting new brass.
Also as mentioned make sure your bolt can use SRP as some will cause issues and you have to get the bolt bushed so you aren't piercing primers.
That depends on use (as well as personal inclination as some just have to get highest possible MVs). Probably 90% + of ICFRA F/TR, 'Match Rifle' and Palma competitors worldwide use SRP 308 Win brass and have done so ever since Lapua introduced the 'Palma' case in 2009 after working with the US Palma Rifle teams to develop it.
In UK F/TR, 308 Win LRP Lapua cases were routinely scrapped after three to five firings pre 'Palma 308'; people now use heavier loads and get double-figure usage. (The reason why everybody anneals now which wasn't necessary before with the case-head being the failure area.)
As I said if you are pushing it to max pressures then yes you will get more with SRP but no real need but I know some do that. Shooting 140s in the 2750fps range is a mid range load and brass will last but if people are trying to push 140s at 2850+ then yes it will kill brass faster.
6.5 forever
Silver $$ Contributor
I load 142 SMK at 2820. I've never had to retire a SRP Lapua case because of a loose primer pocket. I shoot year around with this load at temps in the teens without any affect. SRP is all I need.
Primer model and Powder?
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