Want to use a 20" barrel for a 7PRC mtn rifle. 600 yard max. Is that too short for complete powder burn? Bartlein said it is.
20” barrel for 7PRC
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TC338
Well-Known Member
Barbour creek had a video on barrel length posted here. I believe he went down to a 20" in his test. I'm technologically illiterate or I'd post the link.
TC338
Well-Known Member
Thread 'James goes over barrel length and velocity for hunting long range with a 7 PRC'
https://www.longrangehunting.com/th...y-for-hunting-long-range-with-a-7-prc.339605/
https://www.longrangehunting.com/th...y-for-hunting-long-range-with-a-7-prc.339605/
Short answer…Nope.
You may get hot gases burning tho.
Depends on the powder, & a couple other factors.
Just run suppressed !
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It'll depend a bit on your load too.
Planning on factory ammunition 175s for now. Hill country rifles has a good video on 3 barrel lengths . Kinda made my decision on that
I just built an 18".
Will all powders get 100% burn? No.
Will the powder producing highest velocity get 100% burn? Probably not, though RL26 seems to be a possible anomaly.
Question... why do you care about 100% burn? Depending on your purpose, it may or may not matter.
BTW: a 7prc, even with the fastest burning powder realistic for the cartridge, say H4831(SC), under a 180ELD-M, will burn 100% per QL and will produce plenty of velocity from an 18" barrel for effective 600yd hunting.
Will all powders get 100% burn? No.
Will the powder producing highest velocity get 100% burn? Probably not, though RL26 seems to be a possible anomaly.
Question... why do you care about 100% burn? Depending on your purpose, it may or may not matter.
BTW: a 7prc, even with the fastest burning powder realistic for the cartridge, say H4831(SC), under a 180ELD-M, will burn 100% per QL and will produce plenty of velocity from an 18" barrel for effective 600yd hunting.
Thanks for the info.
7.62 Gunner
Well-Known Member
You get near full burn in the first couple inches of your barrel, everyone talks about powder burn when really they're describing gas expansion.
20" is plenty, I have a 16" 6.5 saum, 18" 7-300 wsm, and a 19" 300 Norma Mag AI.
I shoot 100% suppressed though otherwise they'd all have 26" barrels with brakes
