OK, I'm working up some 223 loads for an AR15
I started with a 55g jacketed projectile (Sierra) cause I have a box of 500 coming from Xtreme soon. Not looking for stellar accuracy but if I can beat commercial typical ammo, I'll be happy. My books on H335 show different start and max loads.
Right now I am using a Carbine with 14.5" barel (16 1/4" with Welded Flash Hider of course) and 1/7 twist.
I have another upper that is 16" and 1/9 twist which will be the main one I work up loads for.
My question is this. Not sure I was trusting my chrono today.
Here are the average velocities I got:
(factory ammo and some previous loads)
Tulamo 55g 2690fps
Winchester 62g 2700fps
25g IMR4895 53g HPBT 2690fps (load I worked up for my dad's AR)
(new reloads)
H335, 55g Jacketed
22.0g 2250fps
22.5g 2260fps
23.0g 2280fps
23.5g 2428fps
24.0g 2510fps
24.5g 2650fps
Varget 69g matchking
23.0g 2220fps
(chrono was erratic for loads between 23.5 and 24.0)
24.5g 2620fps
I was shooting 50 yards with iron sights so I was not really testing the accuracy. I wanted to get ball park velocities before I worked up loads again. I only shot 3 per weight range. One thing I noticed was my first 3 of the 69g match kings even at that low velocity were almost touching. I was not expecting that with that upper I was using.
So the big question I have is the 100fps jumps with 0.5grains of H335, is that expected/typical?
I started with a 55g jacketed projectile (Sierra) cause I have a box of 500 coming from Xtreme soon. Not looking for stellar accuracy but if I can beat commercial typical ammo, I'll be happy. My books on H335 show different start and max loads.
Right now I am using a Carbine with 14.5" barel (16 1/4" with Welded Flash Hider of course) and 1/7 twist.
I have another upper that is 16" and 1/9 twist which will be the main one I work up loads for.
My question is this. Not sure I was trusting my chrono today.
Here are the average velocities I got:
(factory ammo and some previous loads)
Tulamo 55g 2690fps
Winchester 62g 2700fps
25g IMR4895 53g HPBT 2690fps (load I worked up for my dad's AR)
(new reloads)
H335, 55g Jacketed
22.0g 2250fps
22.5g 2260fps
23.0g 2280fps
23.5g 2428fps
24.0g 2510fps
24.5g 2650fps
Varget 69g matchking
23.0g 2220fps
(chrono was erratic for loads between 23.5 and 24.0)
24.5g 2620fps
I was shooting 50 yards with iron sights so I was not really testing the accuracy. I wanted to get ball park velocities before I worked up loads again. I only shot 3 per weight range. One thing I noticed was my first 3 of the 69g match kings even at that low velocity were almost touching. I was not expecting that with that upper I was using.
So the big question I have is the 100fps jumps with 0.5grains of H335, is that expected/typical?