Cleaning regime for magnums

[Awesymoto]

Gentlemen and ladies,

I have a 26” proof barrel that shot the 180 ELDMs like laser beams but accuracy is getting sporadic. some days it’s super accurate 1 ragged hole then 1 MOA OR LARGER same day I tried brass neck tension even new brass but I can’t pin it down. I am left to either my chassis a KRG WHISKEY 3, which I doubt but it If it were I guess a thermal expansion thing or my barrel cleaning. I know guys go a long way before cleaning but when I clean I get significant copperas 20 rounds or so down the tube and the crown when I pull the brake has quite a bit of build up. Anyways magnums can be finicky especially the 28 Nosler but anybody have similar experiences with 7 rem mag or similar?

 

[Barney88PDC]

Is it a carbon fiber barrel?

 

[Awesymoto]

Yes it’s a proof barrel.

 

[Barney88PDC]

Well PROOF makes stainless "regular" barrel blanks in addition to their carbon wrapped ones. I've heard that sometimes the carbon barrels may not hold accuracy on longer strings of fire when they heat up. Magnums may heat up quicker so I would not shoot more than 3 before I let it cool. If you are shooting in rapid succession and the group is opening up, then this may well be the issue. In a hunting rifle its usually not much of an issue because you are usually only shooting 1 shot anyway.

 

[Awesymoto]

Update for historical pourposes. For some reason the bullets were hitting keyholed every 20th or so round 1:8 twist at 3000+FPS switched to Berger’s and so far .3-6 MOA much more consistent. Twist verified and chrono was a magneto speed.

 

[sabrecross]

Update for historical pourposes. For some reason the bullets were hitting keyholed every 20th or so round 1:8 twist at 3000+FPS switched to Berger’s and so far .3-6 MOA much more consistent. Twist verified and chrono was a magneto speed.

Are you shooting 168 VLDs or the 180 VLDs?

 

[D_Lamz]

I push 210 Berger's and 208 amax at almost 3000fps. I've learned to clean my barrel after roughly 100 rounds.

 

[Ledzep]

50-100 or I get fouling build up that spikes pressure.

 

[Awesymoto]

Are you shooting 168 VLDs or the 180 VLDs?

180 Hybrids now, Was shooting 180 ELDM's and 180 ELDx's