Post by awesome on Oct 18, 2020 20:56:44 GMT -5
Alright, so I'm going to ramble a bit here to collect my thoughts.
I bought a box of Hornady 75gr BTHPs last year, and am just now getting around to loading them. I'm low on loaded ammo so I figure I'll go ahead and load up all my bullets that I have in stock. I have some 63gr Sierra SP bullets as well.
The Hodgdon website and my Sierra manual didn't have a load for these 75gr bullets. I found a site where a guy listed Hodgdon and Hornady loads using CFE-223 and Varget with 24.9-26gr max loads. Starting load was 23gr of CFE-223, his most accurate load was 23.5gr, which is actually my most accurate load for the 70gr TSX. I haven't worked that load out all the way yet, because the 70gr TSX rounds are way too expensive for plinking. I got them to MOA accuracy and I shoot pigs with them.
So I'm starting at 23.8gr of CFE-223 (for reasons), OAL of 2.260 (longest I can fit in my magazines), CCI Small Rifle Magnum primers. These 75gr bullets are cheap, but I had really good results with the 69gr SMKs that I've now used up. So I guess I'm going to go head-to-head with these two bullets and see what I'll stick with.
My main problem is that I don't yet own a chronograph. So I was playing around with the Hornady ballistic calculator, and realized I don't have a good idea of what muzzle velocity is going to be.
"24.0 CFE behind the H2279 (75 gr Hornady). 1 MOA at 300 yds. 2550 fps. Out of 18" 1:8 Wylde AR15."
So I would normally expect the same velocity out of my 18" 1:8 Wylde barrel, but now I'm running a suppressor. I don't know how much velocity that adds. It's about 6" long, so does it increase velocity like a longer barrel would, or is it going to be a unique number?
Anyway, at 250yds the come-up for 2750fps (my estimate, maybe high) is 3.16 MOA, which should register as just about 3 dots in my scope at max zoom. I'm going to test this (possibly tomorrow), but I'd like a better idea of what my velocity is going to be like.
I need a chronograph.
Another random thought: a ton of my brass is once-fired Lake City 5.56 (hate metric). I should separate that stuff out, because I can probably get away with loading it a lot hotter than the mixed .223 brass I have. Good for hunting or maybe for really long range. I can only go 300 yards on my range though. My buddy has a 500 yard range.
I bought a box of Hornady 75gr BTHPs last year, and am just now getting around to loading them. I'm low on loaded ammo so I figure I'll go ahead and load up all my bullets that I have in stock. I have some 63gr Sierra SP bullets as well.
The Hodgdon website and my Sierra manual didn't have a load for these 75gr bullets. I found a site where a guy listed Hodgdon and Hornady loads using CFE-223 and Varget with 24.9-26gr max loads. Starting load was 23gr of CFE-223, his most accurate load was 23.5gr, which is actually my most accurate load for the 70gr TSX. I haven't worked that load out all the way yet, because the 70gr TSX rounds are way too expensive for plinking. I got them to MOA accuracy and I shoot pigs with them.
So I'm starting at 23.8gr of CFE-223 (for reasons), OAL of 2.260 (longest I can fit in my magazines), CCI Small Rifle Magnum primers. These 75gr bullets are cheap, but I had really good results with the 69gr SMKs that I've now used up. So I guess I'm going to go head-to-head with these two bullets and see what I'll stick with.
My main problem is that I don't yet own a chronograph. So I was playing around with the Hornady ballistic calculator, and realized I don't have a good idea of what muzzle velocity is going to be.
"24.0 CFE behind the H2279 (75 gr Hornady). 1 MOA at 300 yds. 2550 fps. Out of 18" 1:8 Wylde AR15."
So I would normally expect the same velocity out of my 18" 1:8 Wylde barrel, but now I'm running a suppressor. I don't know how much velocity that adds. It's about 6" long, so does it increase velocity like a longer barrel would, or is it going to be a unique number?
Anyway, at 250yds the come-up for 2750fps (my estimate, maybe high) is 3.16 MOA, which should register as just about 3 dots in my scope at max zoom. I'm going to test this (possibly tomorrow), but I'd like a better idea of what my velocity is going to be like.
I need a chronograph.
Another random thought: a ton of my brass is once-fired Lake City 5.56 (hate metric). I should separate that stuff out, because I can probably get away with loading it a lot hotter than the mixed .223 brass I have. Good for hunting or maybe for really long range. I can only go 300 yards on my range though. My buddy has a 500 yard range.