Tag Archives: Pellet Guns

Benjamin Marauder .25 PCP

If you’re looking for an air rifle for either plinking or for hunting that is a very accurate air rifle then you need to take a look at the Benjamin Marauder. This air rifle is not a toy gun but a very hard hitting accurate gun that is both fun and cheap to shoot. The Benjamin comes in .177, .22 and .25 calibers. I personally own the .25 caliber. There is a ton of information on the gun as far as reviews on the internet. What I’ll be doing in this blog will be talking about my gun and the modifications I have made to the gun to improve its accuracy. The Marauder is an unregulated pcp but Benjamin now has a regulated model available at the time I bought mine they did not offer the regulated rifle.

The Benjamin I purchased was ordered from Pyramyd Air for the synthetic model for around $530 dollars. I also bought a Hawke Vantage 4x16x50 scope $209, a CVlife Bipod to start out with. Since I’ve had the gun I’ve made a few modifications to the gun and shot a lot of different pellet weights and brands to determine which pellet if likes the best. I also added some camouflage tape to the stock and barrel since I use it for squirrel hunting as well as target practice.

My current Marauder

I need to mention that this gun is a PCP or pre-charged pneumatic gun that means it shoots with high pressure air up to 3000 psi. There are a few ways you can charge or air up the gun, a hand pump which I purchased when I bought the gun. The hand pump is very labor intensive to pump 3000 psi into the gun! From a 0 psi up to 3000 psi took me 175 strokes which took me about 30 minutes to do! The other way is to buy a scuba tank or SCBA tank that can be filled at a paintball shop or from a compressor you can buy (but very expensive). There is also the option of using a nitrogen tank which can be rented from a welding supply shop.

$1200 Compressor
$250 to $500 Compressors
Nitrogen Tanks options

The next thing will be ammo in the form of pellets. There are a ton of options on pellets out there. Crossman, JSB, H&N and Air Arms are a few of the brands I use. Every air rifle will shoot a little different and accuracy is achieved by finding the right pellet for your barrel on your gun and the right air pressure you are trying to get to. My gun likes the JSB Exact Diabolo 25.39 grain and the Crossman Domed 27.8 grains the best. Since the barrels on the Marauder has a rifled barrel pellets the gun is very accurate with the right pellet. My gun current as of this writing will consistently shoot .750” five shot groups at 40 yards. This gun with the right pressure and pellet setting will shoot 2” or better groups out to 100 yards.

Pellet Selections are many brands and styles

Without any modifications the gun is still accurate but with modifications you can get better accuracy and more shots on a single air fill than without the modifications. Another thing I need to let you know up front is that air gunning is a very addictive and expensive hobby! But hey, aren’t all our hobbies expensive?

My modifications:

I added a HUMA regulator to the Marauder which cost me around $110 plus shipping. What the HUMA does for the gun is to regulate the amount of air the gun uses for each shot. This will allow you better accuracy and more shots per fill as the amount of air used to push the pellet through the barrel is the same or almost the same every shot. With out the regulator the gun use different amounts of air for each shot and the pressure will drop fast on each shot. The HUMA regulator can be adjusted to the amount of pressure you want, less for more shots and higher for harder hitting shots but with a loss of the number of shots you will get on a fill. I went from getting about 10 to 12 shots to now around 30 to 35 shots after I installed the regulator per fill.

The next modification I did was drilling out the transfer port on both the rifle barrel and the valve in the gun. The transfer port is a small tube that connects the valve (where the air is stored from the regulator or without the regulator) that the air goes through to push the pellet down the barrel on each shot. The factory transfer port hole size is a little over .125” but I drilled mine out to .187” which lets the air out of the valve much faster. Take a straw blow through it and then blow out air without the straw and you’ll see the air from your mouth comes out much faster. This is what drilling out the transfer port does.

The next modification I did was replacing the stock Hammer spring with a Jefferson State Air Rifles TSS or a double spring system. What this does is, when you pull the trigger there is spring behind the hammer. This hammer strikes the valve poppet that lets the air out the valve up the transfer port and pushes the pellet down the barrel. What happens is that the hammer strikes the poppet pin and the spring bounces back and forth on the poppet several times before it settles down. When this happens each time the hammer bounces on the poppet pin it releases a small amount of high pressure air out of the fill tube. This will greatly reduce the number of shots you will get from a fill. By replacing the hammer spring with the TSS, the hammer will not strike the hammer again after the first strike thus saving air in the tube resulting in more shots; the cost of the TSS was around $80 plus shipping. So as you see tweaking and modifying your gun can get expensive or you can leave it alone and just shoot it the was it comes from the factory. To me it’s like having a muscle car from the factory and not doing upgrades to make it better!

Jefferson State Air Rifles TSS
40 Yard 5 Shot Groups with my Marauder after Modifications.
Crows and Squirrels I’ve taken with my Marauder

Final thoughts, so as you can see there is a lot you can do with a PCP air rifle. Check out the many options of guns out there, they range in prices from $200 up to $2000 dollars! But at about $16 for a box of 500 pellets this is a very cheap way to practice compared to the cost of rim fire or center fire rifles. So have fun and I hope this opens your eyes to PCP air guns.

Thanks for checking out my blog articles.