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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bolt lug contact and amount of free float
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<blockquote data-quote="340PR" data-source="post: 1914127" data-attributes="member: 107814"><p>My $0.02. I have two T3x, one purchased about 12 mo after the other, both in 6.5CM. T1 was .5MOA or less, out of the box, using factory ammo (Norma match). With load development, was consistently .375MOA or better, depending on the shooter. Ran over 3000 rounds through T1, and won a 600yd target match the last time I shot it stock. What I noticed was that the hammer forged barrel was much slower in muzzle velocity than other rifles (2670 vs 2720) same load, bullet weight etc.. Also, as the round count went up, the MV went down (at 3k rounds, 2620). cleaning didn't seem to matter much (tried several intervals and levels). T2 was a .5 MOA rifle out of the box (on a good day). No matter what I did, I could not get it to shoot like T1. FYI. the muzzle velocity issue was the same as T1. </p><p>Put a Broughton 5R barrel on T1, and noticed a substantial increase in MV (2820 with same load). Won the first match I shot this year, with 160 rounds total on the barrel. The amazing thing to me was that the vertical spread was 0.100" over 4/5 round targets. Again, a 600yd match, with a 2.234" aggregate.</p><p>NOTES:</p><p>1. both rifles are free floating (factory).</p><p>2. I bump the shoulders back to "0", meaning that when the round is chambered, I can feel the shoulder seat as the bolt locks.</p><p>3. I run an "off barrel" V3, and record environmentals on all sessions except matches.</p><p>4. I have done a <u>LOT</u> of testing with case volume vs. load accuracy, etc. and found that ES is not the determining factor to accuracy (within reason).</p><p>5. I noticed that Forged barrels took longer to warm up than the Boughton (all within 1.5" @ 100 yds). factory CCB 1st impact is upper left, and strings down to center over 6-8 rounds. Broughton CCB is just low and left, and centers in 3-5 rounds. </p><p></p><p>Finally, to answer your question, both Tikkas show equal bolt wear on the lugs, AND they are smoooth...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>hope this helps</p></blockquote><p></p>
[QUOTE="340PR, post: 1914127, member: 107814"] My $0.02. I have two T3x, one purchased about 12 mo after the other, both in 6.5CM. T1 was .5MOA or less, out of the box, using factory ammo (Norma match). With load development, was consistently .375MOA or better, depending on the shooter. Ran over 3000 rounds through T1, and won a 600yd target match the last time I shot it stock. What I noticed was that the hammer forged barrel was much slower in muzzle velocity than other rifles (2670 vs 2720) same load, bullet weight etc.. Also, as the round count went up, the MV went down (at 3k rounds, 2620). cleaning didn't seem to matter much (tried several intervals and levels). T2 was a .5 MOA rifle out of the box (on a good day). No matter what I did, I could not get it to shoot like T1. FYI. the muzzle velocity issue was the same as T1. Put a Broughton 5R barrel on T1, and noticed a substantial increase in MV (2820 with same load). Won the first match I shot this year, with 160 rounds total on the barrel. The amazing thing to me was that the vertical spread was 0.100" over 4/5 round targets. Again, a 600yd match, with a 2.234" aggregate. NOTES: 1. both rifles are free floating (factory). 2. I bump the shoulders back to "0", meaning that when the round is chambered, I can feel the shoulder seat as the bolt locks. 3. I run an "off barrel" V3, and record environmentals on all sessions except matches. 4. I have done a [U]LOT[/U] of testing with case volume vs. load accuracy, etc. and found that ES is not the determining factor to accuracy (within reason). 5. I noticed that Forged barrels took longer to warm up than the Boughton (all within 1.5" @ 100 yds). factory CCB 1st impact is upper left, and strings down to center over 6-8 rounds. Broughton CCB is just low and left, and centers in 3-5 rounds. Finally, to answer your question, both Tikkas show equal bolt wear on the lugs, AND they are smoooth...:) hope this helps [/QUOTE]
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Bolt lug contact and amount of free float
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