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Model 70 Classic BOSS 280 Rem

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Category: Firearms, Bows, and Ammunition
Forum Name: The Range Report
Forum Description: Shooting results/targets, range conditions (Online data book)
URL: http://www.opticstalk.com/forum_posts.asp?TID=39192
Printed Date: March/29/2024 at 07:17
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Topic: Model 70 Classic BOSS 280 Rem
Posted By: M7025-06
Subject: Model 70 Classic BOSS 280 Rem
Date Posted: January/05/2014 at 11:11
I sold my X-Bolt right after deer season and got a hold of a new-to-me Model 70 Classic BOSS 280 Rem.  After throwing an SS 3-15x42 on it and working up a few loads with both R22 & IMR-4831, I finally got it out to the range right before Christmas.

I was little skeptical with the BOSS & shorter barrel as far as what I could get for velocities, but after running it through the chronograph, I found a load with the R22 giving me right around 2900 fps (had to sneak over book max to get there-no pressure signs), plus it printed a nice 0.90'' group @ 200 yds with the BOSS set on the recommended setting (4).  All in all, I'm more than happy.

I wanted to go retest this load this morning, but it's 2* with 30 mph North winds (-15*) so I think it'll have to wait.





Replies:
Posted By: Kickboxer
Date Posted: January/05/2014 at 12:16
Be aware that the BOSS "recommended setting" is merely a starting point for "tuning" the BOSS for maximum performance.  Tuning the BOSS can be a time consuming, but very worthwhile, endeavor.  From the "recommended setting", adjust "out" or "in"  in very small increments (I use 1/8 turn to start and then smaller once I get near the spot) to find the "sweetspot"… the spot where the harmonic exactly cancels.  

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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: M7025-06
Date Posted: January/05/2014 at 12:54
I remember you telling me that.

I didn't have enough reloads to play with it too much, but I did adjust it in & out about a 1/4 turn on 2 different sets, and holy cow did that make difference.  The grouping went from the picture to 3'' to over 6'' (all at 200 yds).  Plus with the muzzle brake, it kicked like my 11 lb 243.




Posted By: Kickboxer
Date Posted: January/05/2014 at 13:27
The "recommended setting" is rarely optimum, in my experience.  I've, a couple of times, found a particular ammo that did not require adjustment… specifically, Winchester Fail-Safe 180gr 30-06 and 140gr Fail-Safe 7mmRemMag.  I've had, overall, pretty good luck with Fail-Safe.  

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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: M7025-06
Date Posted: January/05/2014 at 13:45
Have you used the CR BOSS and did you find any difference as far as it requiring a different setting for the same load, between it and the muzzle brake (besides recoil)?




Posted By: Kickboxer
Date Posted: January/05/2014 at 14:24
I have BOSS CR for both the 30-06 and 7mmRemMag and "YES", you will have to readjust for maximum performance.  However, I've not found the re-adjustments to to be significant.  Small adjustments using the BOSS brake as a starting point have been sufficient.

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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: M7025-06
Date Posted: January/05/2014 at 15:55
Good deal.  

Thanks KB.





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