Greg Nolan
Handloader
- Nov 25, 2004
- 2,143
- 18
Today I took the 8MM Rem Mag to the range today to start prelim velocity and pressure checks. Ammoguide had loads for 200 gr bullets with a max of 88 grs. of Reloder 25. I started with new Rem brass CCI 250 primers and a load of 86 grs. OAL was 3.6 " and used a 200 gr A/B.
I loaded three groups of three at 86, 87 and 88 grs. I marked the bullets of each group with the powder weight. I measured each load individually and verified the OAL with a micromiter on each cartridge.
Here are the results:
86 grs. = 3031-3034-3038 Nice consistancy and about the velocity I expected.
87 grs. = 3390-3401-3356 Pressure looked the same as 86 grs but the velocity is unreal looking.
88 grs. = 3284-3290 and one didn't read . If I hadn't been so carefull about seperating and marking the loads it would seem 87 and 88 are reversed.
All the charges are compressed and it's a 24" barrel. I don't remember ever seeing a drop in velocity with a bigger charge of powder. Is there any pressure anomily that could do that?
I've reloaded another group of 87 and 88 gr loads to re check with but I'm puzzled. :roll: I Spoke with some very knowedgable folks at the range and they verified my pressures didn't look bad in fact all 3 looked about the same. Easy extraction of the bolt and case. The Chrony was about 12 or so feet from the muzzle.
I loaded three groups of three at 86, 87 and 88 grs. I marked the bullets of each group with the powder weight. I measured each load individually and verified the OAL with a micromiter on each cartridge.
Here are the results:
86 grs. = 3031-3034-3038 Nice consistancy and about the velocity I expected.
87 grs. = 3390-3401-3356 Pressure looked the same as 86 grs but the velocity is unreal looking.
88 grs. = 3284-3290 and one didn't read . If I hadn't been so carefull about seperating and marking the loads it would seem 87 and 88 are reversed.
All the charges are compressed and it's a 24" barrel. I don't remember ever seeing a drop in velocity with a bigger charge of powder. Is there any pressure anomily that could do that?
I've reloaded another group of 87 and 88 gr loads to re check with but I'm puzzled. :roll: I Spoke with some very knowedgable folks at the range and they verified my pressures didn't look bad in fact all 3 looked about the same. Easy extraction of the bolt and case. The Chrony was about 12 or so feet from the muzzle.