Optimal powder for 20" barrel? 308 155gr scenars

rc2125

Sergeant
Full Member
Minuteman
Oct 24, 2007
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Granger, Indiana
Gettin back into reloading. Got my feet wet in the past, but sold everything cuz ammo was cheaper than my time was worth to me.
Anyhow, with the current predicament we are in, I ordered another press and am fixin to get all the other stuff I need in the following weeks.
I got a 20" barrel on this new rifle, FN SPR A1A 308, which really likes FGMM 168's. Chrono'd the factory loads at just over 2600fps (6ft from muzzle), which seemed pretty good for the shorter barrel?

Thinking that I want to initially get set up for 155 scenar bullets (if test batches show promise), using once fired federal and winchester brass, I have a couple concerns:

Any powders better for shorter barrel length (20")?

Would probably also want whichever one contributes to the least amount of muzzle flash?

Proven recipes? (found numerous recipe's, but not necessarily specific to 20" length)

May tinker out to a thousand yards every now and then, but for the most part under 500 around here.

I'll do some more searching tomorrow, figured I'd ask also.

RC
 

MitchAlsup

Gunny Sergeant
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Feb 19, 2007
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Austin Texas
Re: Optimal powder for 20" barrel? 308 155gr scenars

See if you can work you way up to 47.8 gr varget in Win cases, seating the bullet 0.015 from the lands. This should put you above 2900 fps.
 

flyboy

Gunny Sergeant
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Jul 31, 2008
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Clearfield, PA
Re: Optimal powder for 20" barrel? 308 155gr scenars

Thanks for asking, I'm in the same place 155's or 168's
 

Wil

PRE
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Feb 16, 2006
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Re: Optimal powder for 20" barrel? 308 155gr scenars

Remington 700p LTR .308 (20")

45.5gr IMR4895
Lapua Brass
155gr Lapua Scenar
210 Primer
2.83 OAL (max mag length)

46.6gr IMR4895
BHA/Win Brass
155gr Lapua Scenar
210 Primer
2.83 OAL
*** No chrono data on this load yet, but I only need 31MOA to reach 1K ('Real world' come up not QL prediction)***


48gr IMR4895
BHA/Win brass
155gr Lapua scenar
210 primer
2.9 OAL
***required 29MOA to 1K at Tiger Valley***


47.4gr Varget
BHA/Win brass
155gr Laupa Scenar
210 Primer
2.86 OAL (fits in an AICS mag no problem)
** required 2.3-2.4 Mils to reach 600 at Camp Swift (24" barrel) **

AS ALWAYS...THESE ARE MY LOADS..SAFE IN MY GUN... PLEASE WORK UP!