Recently brought a new second-hand Blaser R93 in 300 win mag 25.5" barrel and have been building up a load for it using 178 gr Hornady Amax with H4831sc federal 215 primers and new Winchester brass annealed trimmmed etc.
Started off at 70 grains and ended up with 73.5 on the first outing going up in 1/2 grain lots 73 being stated in my Lee manual as max for 180gn. Bullets were seated as far out as possible to still fit in the mag at 3.325 total length.
Rifle shot exceptionally well with the worst 3 shot group being 1.1" and the best .43" .
Chrono clocked the starting loads at around 2840 and max load at av of 2935.
Accuracy was great but I thought I might be able to get the magic 3000 as there no signs of excessive pressure at 73.5.
I loaded some more bombs from 73.5-74.5 Thinking surely ill reach 3000 or flatten a primer what ever comes first.
Not so, no signs of pressure and still no significant rise in MV at 2976 av.
Back home to load more hotter rounds 74.5- 75.5 surely this time!
Back to the range finally broke 3000 barely but STILL no signs of excessive pressure!
Cases ejected easily primer looked the same as at 70gn even under my magnifying glass!??
I have settled on a very accurate load of 74 grains that averages around 2948 but am still intrigued as to how much powder this bad boy will take before it flattens a primer or at least shows some signs.
As I'm relatively new to reloading (2years .270&.243 ) and belted magnums, is this normal and would it be safe to keep going? My 270 Tikka sticks pretty hard to the book and quickly shows signs around stated max loads. Is this normal for 300 win mags?
Any help would be much appreciated. Thanks
Started off at 70 grains and ended up with 73.5 on the first outing going up in 1/2 grain lots 73 being stated in my Lee manual as max for 180gn. Bullets were seated as far out as possible to still fit in the mag at 3.325 total length.
Rifle shot exceptionally well with the worst 3 shot group being 1.1" and the best .43" .
Chrono clocked the starting loads at around 2840 and max load at av of 2935.
Accuracy was great but I thought I might be able to get the magic 3000 as there no signs of excessive pressure at 73.5.
I loaded some more bombs from 73.5-74.5 Thinking surely ill reach 3000 or flatten a primer what ever comes first.
Not so, no signs of pressure and still no significant rise in MV at 2976 av.
Back home to load more hotter rounds 74.5- 75.5 surely this time!
Back to the range finally broke 3000 barely but STILL no signs of excessive pressure!
Cases ejected easily primer looked the same as at 70gn even under my magnifying glass!??
I have settled on a very accurate load of 74 grains that averages around 2948 but am still intrigued as to how much powder this bad boy will take before it flattens a primer or at least shows some signs.
As I'm relatively new to reloading (2years .270&.243 ) and belted magnums, is this normal and would it be safe to keep going? My 270 Tikka sticks pretty hard to the book and quickly shows signs around stated max loads. Is this normal for 300 win mags?
Any help would be much appreciated. Thanks