hey guys since my first post looking to Slow my rounds down so I could better enjoy my shooting experience with my 280 Remington all of the great information gleaned from here was a total wonderment and awe as to the knowledge and intelligence the collective we have here on this forum
is just staggering.. so I come to you once again looking for understanding and insight as to what I have come across.. Ok first thing first while on Loaddata .com researching good loads with H4895 for 168gr and 175gr bullets for my 280 was a slim picken at best …. but there were loads for them nonetheless and I used the 60% rule to establish my rock bottom load.. from there I added 2grs just for G.P. that turned out to be a total of 30.5gr of H4895. so I put together 20 rounds of 175 gr Hornady round noses and 20 rounds of 175gr Hornady SST's. When I got to my range to shoot,, My first target was at fifty yards and bullet of choice was my round nose.. the first 5 rounds printed a nice 3/4 inch maybe 1 inch group and I took it to 100 yards. first group was 1-1/2 5 round string...ok round noses did just fine,, Next up are the SST's When driven to 2700fps out of my rifle I get really good groups of 3/4 inch at 100 yards So now I pull the trigger on the SST's and I actually hear a THUMP.. so I go look at the target..... every round was a KEYHOLE on the target at fifty yards!!! ok so here is the question.... why would this projectile be so accurate at 2700fps and keyhole at 2100fps? it doesn't make sense the round nose didn't care what speed it was traveling it performed flawlessly fast and slow but the SST? not so much,,,, has anybody ran into this issue before?
is just staggering.. so I come to you once again looking for understanding and insight as to what I have come across.. Ok first thing first while on Loaddata .com researching good loads with H4895 for 168gr and 175gr bullets for my 280 was a slim picken at best …. but there were loads for them nonetheless and I used the 60% rule to establish my rock bottom load.. from there I added 2grs just for G.P. that turned out to be a total of 30.5gr of H4895. so I put together 20 rounds of 175 gr Hornady round noses and 20 rounds of 175gr Hornady SST's. When I got to my range to shoot,, My first target was at fifty yards and bullet of choice was my round nose.. the first 5 rounds printed a nice 3/4 inch maybe 1 inch group and I took it to 100 yards. first group was 1-1/2 5 round string...ok round noses did just fine,, Next up are the SST's When driven to 2700fps out of my rifle I get really good groups of 3/4 inch at 100 yards So now I pull the trigger on the SST's and I actually hear a THUMP.. so I go look at the target..... every round was a KEYHOLE on the target at fifty yards!!! ok so here is the question.... why would this projectile be so accurate at 2700fps and keyhole at 2100fps? it doesn't make sense the round nose didn't care what speed it was traveling it performed flawlessly fast and slow but the SST? not so much,,,, has anybody ran into this issue before?