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Bushmaster ORC: upgrade or trade?


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Old 02-16-2016, 03:24 AM   #1
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Default Bushmaster ORC: upgrade or trade?

It's a 16" flat-top with chopped off Front sight block, M4 profile, and chrome-lined, standard handguards. Accuracy is ok: about 1.75" 5-shot groups with American Eagle 50gr. Varmint tips.

I want a lightweight rifle for walking, shooting coyotes, and shooting groundhogs, also some bench-top shooting. 200-250 yards would be my max hunting range. I have a RRA 2-stage varmint trigger, and a Weaver Super Slam 2-10x50. I want to keep and use these parts on this setup.

I'm thinking about putting on a 7" free-float tube with a single stud, and changing the gas block to eliminate the dangling sling attachment.

I'm hoping that I can get my group sizes down 1/4"-1/2" with the free-floating, and better rest (bi-pod). The main reason is a 3.5" pattern at 200 yards seems too big for groundhog shooting. Part of the group size could well be the 10x optics - maybe more X's = smaller groups...

instead of spending $80 for a basic float tube/sling stud and $45 for a gas block, would I be better off selling my upper and buying something different?

Last edited by Shopfox; 02-16-2016 at 03:29 AM.
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Old 02-16-2016, 06:00 PM   #2
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Quote:
Originally Posted by Shopfox View Post
It's a 16" flat-top with chopped off Front sight block, M4 profile, and chrome-lined, standard handguards. Accuracy is ok: about 1.75" 5-shot groups with American Eagle 50gr. Varmint tips.

I want a lightweight rifle for walking, shooting coyotes, and shooting groundhogs, also some bench-top shooting. 200-250 yards would be my max hunting range. I have a RRA 2-stage varmint trigger, and a Weaver Super Slam 2-10x50. I want to keep and use these parts on this setup.

I'm thinking about putting on a 7" free-float tube with a single stud, and changing the gas block to eliminate the dangling sling attachment.

I'm hoping that I can get my group sizes down 1/4"-1/2" with the free-floating, and better rest (bi-pod). The main reason is a 3.5" pattern at 200 yards seems too big for groundhog shooting. Part of the group size could well be the 10x optics - maybe more X's = smaller groups...

instead of spending $80 for a basic float tube/sling stud and $45 for a gas block, would I be better off selling my upper and buying something different?
Yes, I doubt if you can get the ORC to shoot in the 1/4"-1/2" range.
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Old 02-16-2016, 06:14 PM   #3
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I Worded it poorly, I want to get down to 1.25" to 1.5" groups. I'm close, but not there. Not sure if spending the money on the float tube will give me the nudge.
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Old 03-03-2016, 05:36 AM   #4
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Case closed. I was having problems getting my groups tighter. I wasn't having much success. Through trial and error, on another rifle I found I could get better consistency and results by shooting with a bipod off bare earth vs a bipod on the bench. Applying this same lesson, I took the Lead Sled DFT off the benchtop, and used it from the prone position on the ground (The ORC doesn't have a sling stud to attach a bipod, so it had been difficult for me to get it really steady in the past).
All 5-shot groups 100 yards:
American Eagle 50gr: 0.817"
Hornady TAP 55gr: 1.377"
Hornady TAP 55gr: 1.271"
Ave of Hornady: 1.324"

Basically, I'm where I want to be for this rifle, and adding a free-float handguard will help me to add a bi-pod and reduce tensioning the barrel, making these numbers achievable without the Lead Sled.

Last edited by Shopfox; 03-03-2016 at 05:45 AM. Reason: Tense correction
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Old 03-03-2016, 05:40 AM   #5
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Pics for my notebook...
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Old 03-03-2016, 05:43 AM   #6
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Hornady group 1
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Old 03-03-2016, 05:44 AM   #7
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Hornady Group 2
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Old 03-03-2016, 05:56 PM   #8
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Quote:
Originally Posted by Shopfox View Post
It's a 16" flat-top with chopped off Front sight block, M4 profile, and chrome-lined, standard handguards. Accuracy is ok: about 1.75" 5-shot groups with American Eagle 50gr. Varmint tips.

I want a lightweight rifle for walking, shooting coyotes, and shooting groundhogs, also some bench-top shooting. 200-250 yards would be my max hunting range. I have a RRA 2-stage varmint trigger, and a Weaver Super Slam 2-10x50. I want to keep and use these parts on this setup.

I'm thinking about putting on a 7" free-float tube with a single stud, and changing the gas block to eliminate the dangling sling attachment.

I'm hoping that I can get my group sizes down 1/4"-1/2" with the free-floating, and better rest (bi-pod). The main reason is a 3.5" pattern at 200 yards seems too big for groundhog shooting. Part of the group size could well be the 10x optics - maybe more X's = smaller groups...

instead of spending $80 for a basic float tube/sling stud and $45 for a gas block, would I be better off selling my upper and buying something different?
What is the twist rate of your barrel?
You may benefit by using heavier bullets such as 175 grain.
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Old 03-03-2016, 07:00 PM   #9
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I'f you are good to go with removing a pinned gas block, I say go with installing the freefloat.
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Old 05-05-2016, 04:38 PM   #10
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I ended up putting a carbine length Hogue free-float tube on w. bipod swivel ($60 installed). I reused my bastard gas block. I resighted it in off the bipod. 3 Groups ranged from 1-1/8" to 1-3/8". Accuracy is sufficient for my use.

the lead sled can now be left at home.
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