Not having these items in front of me for comparison, I will say that in general it will come down to the action-screw spacing. If the action and the stock match in that regard, it should be possible to achieve a fit with judicious inletting and bedding. It can be a long, slow process of cut-and-try, but rushing it is a recipe for failure.
When I bought a new Hawkeye shortly after they came out, I decided to purchase a Boyds laminate for the SS Hawkeye. None was listed on their site, so I called and asked if their MKII would fit the New Hawkeye.
They didn't know so they called Ruger. Inletting IF barrel contour and action sizes match is the same. That MKII stock has now been on two Hawkeye rifles; perfect fit, no inletting needed.
The differences were a matte finish to both blue and SS Hawkeyes and a slimmer walnut stock profile with wrap around checkering on the forend. The Hawkeye also has a Ruger emblem engraved on the floorplate. It's my understanding that the newer blued Hawkeyes have a more polished finish more like the MKIIs now tho.
The Hawkeyes also have a new trigger called the LC6 - although I must confess that I see only easier (read cheaper) manufacturing in the design and do not see or feel any change from even the original M77. I have all three models and the Hawkeye is as nice a shooter as the original tang safety M77 is. The old M77 stock is bulky and unnessecarily heavy and as soon as my checkering skills are better than presently I am working mine down to the Hawkeye contour and profile.
I was disappointed in the bolt finishing (both inside and out) of my brand new Hawkeye and had to spend about a week of evening work to get is as slick at the M77 and M77 M. II.
I have swapped stocks back and forth, and even swapped a boat-paddle onto a Hawkeye.
The footprint is identical, the only tangible difference is in the barrel diameter coming out of the receiver. It is bigger, longer on the predators, but a regular Hawkeye needed a wee bit of relieving to fit the boat paddle.
I shoot a left hand model M77 in 300 WM. The original stock shattered (always check those screws!). I sent it back to Ruger. They called and said the only thing they had in a left hand was the Hawkeye stock. It's fits perfect
, so I'd assume you can switch back and forth.
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