I haven't found that at all. I clean my barrel every 250 rounds, and its not too badAre you finding R33 to be dirty? I’m reading of people having to clean every 30-40 rounds.
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I haven't found that at all. I clean my barrel every 250 rounds, and its not too badAre you finding R33 to be dirty? I’m reading of people having to clean every 30-40 rounds.
I've had really good luck with 570I was informed my 30in 1-8 new Bartlein steel barrel has shipped to my smith. I am planning on running Berger 230 hy's as well as 230 -Tips. I just got 8 pounds og N568 so I am going to give that a try, I do have N570 , Retumbo as a back up plan.
I've shot the 230 Berger in my 10 twist 300 WM for a while now and it has performed well out to 1250 yards. My 300NM 35˚ IMP has a Krieger 1 in 9 twist. I can shoot either 215 Hybrids or any of the 230 grain bullets as far as I am gonna have room for here without issue. I wonder if the 8 twist in a fast moving 30 will be enough RPM to have sporadic bullets turning to vapor?I was informed my 30in 1-8 new Bartlein steel barrel has shipped to my smith. I am planning on running Berger 230 hy's as well as 230 -Tips. I just got 8 pounds og N568 so I am going to give that a try, I do have N570 , Retumbo as a back up plan.
I shoot with an 8 twist 28" K&P. I have no issues so far with it shooting the 230s. I have about 400ish rounds through it so far. Nothing special with the gun. Just an RPR with an LRI chambered 300 norma improved barrel.I've shot the 230 Berger in my 10 twist 300 WM for a while now and it has performed well out to 1250 yards. My 300NM 35˚ IMP has a Krieger 1 in 9 twist. I can shoot either 215 Hybrids or any of the 230 grain bullets as far as I am gonna have room for here without issue. I wonder if the 8 twist in a fast moving 30 will be enough RPM to have sporadic bullets turning to vapor?
N565I was informed my 30in 1-8 new Bartlein steel barrel has shipped to my smith. I am planning on running Berger 230 hy's as well as 230 -Tips. I just got 8 pounds og N568 so I am going to give that a try, I do have N570 , Retumbo as a back up plan.
Trying to figure out this AXMC Proof Prefit barrel on why I am getting hard bolt lift at times. It would do it probably half the time and getting some ejector marks. Even some of the lighter loads in testing would do this.
Current load is:
Lapua Brass sized .002 from fired.
84.5gr Retumbo, should be well under max
225gr ELDMs at 3.60 COAL would have to check but should be around there
It shoots lights out, have had a couple of groups well in the teens. Had it out yesterday for some longer range confirmation and had no problems hitting 1 MOA targets out to 1k.
Only thing I could think of is the OAL of the chamber is too short from Proof? I had a .243 barrel once that was cut too short for me to shoot the 115gr DTACs and had the throat reamed out and it shot fine with no pressure issues.
Brass is probably on it's 3rd or 4th firing. Only have used about 30 cases so far for the initial load development and to make sure everything is OK with the load. I checked a sized case with no bullet and it will chamber and extract fine. Die is a Whidden FL Neck sizer. Cases are also annealed after every firing with a AMP.
I never had any problems closing the bolt, empty or a loaded round. Only fired I would get the issue.
I can get the 250 Atips to 2880fps with 88.5 grains of H50BMG powder. It runs best at 2820 and 87 grains. I'm tempted to try some RL50 at 88-91 grains and see if I cant squeeze out a tiny bit more speed out of a 28" barrel. Sorry Im fresh out of RL50 or I'd give it a try. Anyone else ran 250 Atips behind some RL50?Has anyone has success with the 220 ELD-X or 250 A Tip with RL-50?
Right on so 4-5 firings between trimming?.003-004 with heavy loads and standard chamber.
Right on so 4-5 firings between trimming?
Right on so 4-5 firings between trimming?
Trying to figure out this AXMC Proof Prefit barrel on why I am getting hard bolt lift at times. It would do it probably half the time and getting some ejector marks. Even some of the lighter loads in testing would do this.
Current load is:
Lapua Brass sized .002 from fired.
84.5gr Retumbo, should be well under max
225gr ELDMs at 3.60 COAL would have to check but should be around there
It shoots lights out, have had a couple of groups well in the teens. Had it out yesterday for some longer range confirmation and had no problems hitting 1 MOA targets out to 1k.
Only thing I could think of is the OAL of the chamber is too short from Proof? I had a .243 barrel once that was cut too short for me to shoot the 115gr DTACs and had the throat reamed out and it shot fine with no pressure issues.
I have 8 pounds of N568, but I have been using retumbo and getting 3050fps with 230 a tips and shoots .2” groups. What data have you got with the n568? What velocitys are you seeing and how’s the accuarcy?I was informed my 30in 1-8 new Bartlein steel barrel has shipped to my smith. I am planning on running Berger 230 hy's as well as 230 -Tips. I just got 8 pounds og N568 so I am going to give that a try, I do have N570 , Retumbo as a back up plan.
I use .1 off the lands and 82.7 Retumbo @ 3.6 OAL with 250 A-tip. Gives 2820 FPS with 5-7 SD and Sub 12 ES. 28" ES Tactical barrel.Howdy folks, has anybody got any recommendations/tips for the recommended jump/seat depth for 250 atips in 300NM?
running a 30" 1/8" barrel with F215GM and N570
I have done some comprehensive testing on the 225ELDM with N570 - I will be sharing that here soon...
/EK
I have had really good luck with H50BMG and 250 grain atips. For me Retumbo or H1000 are slightly faster for the 215-230 grain bullets. I have never tried any N570 b/c it has been unobtainium for the last year. Practically speaking, H50BMG and Atips have been more readily available as compared to Berger bullets and Vihtavori powder. Of course currently the limiting factor for my 300 Norma is large rifle primers.Just put together a 300 Norma and doing some load experimentIng. Trying some 50 BMG based off of a buddy’s experience but Im not sure I’m gonna get enough velocity out of it before I’m crushing powder. Hopefully the barrel speeds up a bit.
Late to the party, but why do you believe H4350 is going to burn out the barrel? Best I can tell, its heat potential is actually less than most popular powders for the 300NM and you use 10% less - so my understanding is the barrel would actually last longer (I'm very open to hearing why it would burn the barrel quicker because I agree, it seems counter-intuitive to what I would expect).You're just burning up the barrel with that powder. You should be running that 220 around 3100 fps at max pressure with the right powder. Why bother for 300 WSM ballistics?
You've pretty much duplicated my results. It's as if that bullet/powder combo were made for the 300 Norma.N570 245 EOL
85.5 2969 avg 4.5/11
86.5 3004 avg 5.2/11
3 shots
85.5 2957 3.6/7
85.7 2984 .5/1. Only 2 on chrono 3 shots one hole.
85.9 2986 6.7/10 2 registered
86.1 2987 3.1/6
86.3 2994 4.5/9
86.5 2994 3.7/7
View attachment 8025687
What's your BTO or COAL?N570 245 EOL
85.5 2969 avg 4.5/11
86.5 3004 avg 5.2/11
3 shots
85.5 2957 3.6/7
85.7 2984 .5/1. Only 2 on chrono 3 shots one hole.
85.9 2986 6.7/10 2 registered
86.1 2987 3.1/6
86.3 2994 4.5/9
86.5 2994 3.7/7
View attachment 8025687