picked up some 208 amax's and loaded them from 51 grains to 58.2 grains in .3 grain increments of h4350. figured i'd look for pressure then work backwards to find the nearest node. now for reference this is a 1903a3 30-06 and there's no way i can get anywhere close to the lands if i want to be able to use the mag. loaded to max mag length there's still another 3/8" before i touch the lands.
anyways i kinda expected to find pressure around 55.5 to 56 grains but the bolt handle didn't start getting sticky till about 57 grains and didn't get really sticky till the last charge of 58.2, now for some reference it doesn't matter what the charge is, this gun gets a sticky handle every 3 or 4 rounds for some unknown reason so i don't normally pay much attention to a sticky bolt. here's what my brass looked like. tell me what you think
now i was really expecting the 208 poi to be alot lower then my 155 poi considering i'm pushing 60 gr of h4350 on a much lighter bullet but the last 4 charges of the 208 were either even with my 155 zero or higher. that just doesn't make sense to me because i know i'm no where close to the same velocity or higher and in the case of the 58.2 gr charge it was about an inch higher then the 155 zero. my best guess from looking at similiar charges and barrel lengths the 155 i shoot should be in the neighborhood of 3150 fps where as the 208 should be in the neighborhood of 2650 to 2700. so like i said the poi shift doesn't make much sense to me. anybody able explain that?
last question is today it was 80 degrees out but our summers are in the 105 to 110 range. should i drop 1 grain for increased summer temps raising case pressures or should i even worry about it with the h4350? i'm actually hoping to rebarrel before next summer but incase i have another crappy year financially i want to make sure my gun doesn't blow up in my face at the range if i stay with whatever charge weight the nearest node ends up being. with the way the poi moved with the charge weights i'm pretty sure a node is going to be in the 56.7 range so i'm going to load from 56 to 57 in .2 grain increments and ocw it
so what's the all knowning sniper's hide think?
anyways i kinda expected to find pressure around 55.5 to 56 grains but the bolt handle didn't start getting sticky till about 57 grains and didn't get really sticky till the last charge of 58.2, now for some reference it doesn't matter what the charge is, this gun gets a sticky handle every 3 or 4 rounds for some unknown reason so i don't normally pay much attention to a sticky bolt. here's what my brass looked like. tell me what you think
now i was really expecting the 208 poi to be alot lower then my 155 poi considering i'm pushing 60 gr of h4350 on a much lighter bullet but the last 4 charges of the 208 were either even with my 155 zero or higher. that just doesn't make sense to me because i know i'm no where close to the same velocity or higher and in the case of the 58.2 gr charge it was about an inch higher then the 155 zero. my best guess from looking at similiar charges and barrel lengths the 155 i shoot should be in the neighborhood of 3150 fps where as the 208 should be in the neighborhood of 2650 to 2700. so like i said the poi shift doesn't make much sense to me. anybody able explain that?
last question is today it was 80 degrees out but our summers are in the 105 to 110 range. should i drop 1 grain for increased summer temps raising case pressures or should i even worry about it with the h4350? i'm actually hoping to rebarrel before next summer but incase i have another crappy year financially i want to make sure my gun doesn't blow up in my face at the range if i stay with whatever charge weight the nearest node ends up being. with the way the poi moved with the charge weights i'm pretty sure a node is going to be in the 56.7 range so i'm going to load from 56 to 57 in .2 grain increments and ocw it
so what's the all knowning sniper's hide think?
