You might want to consider using higher multiplier and more hull space for your ships engines also, for early system defence ships I generally give them *1.25 multiplier engines taking up 20-30% of hull space and barely enough fuel to get around sol, maybe 10 billion kilometers, if used in combat they'll drain your fuel reserves, but they are your last line of defence and will still be useful in that role a few tech levels later.

What's your warhead tech? I'm guessing it's 3x MSP and you have 1MSP dedicated to warhead. Try 1.334 MSP for the warhead, a 3.5MSP engine with the maximum power multiplier, and 0.166MSP for fuel.

You can reduce the fuel your missile carries.

Okay managed to get it to get it down to a range matching my fire control with a little wiggle room beyond. Ive also upgraded it with my new Nuclear pulse missile engine tech to give it a grand speed of Speed: 7900 km/s

Striker Mk IV:
Missile Size: 4.95 MSP  (0.2475 HS)     Warhead: 3    Armour: 1.4     Manoeuvre Rating: 10
Speed: 7900 km/s    Engine Endurance: 62 minutes   Range: 29.6m km
Cost Per Missile: 1.5876
Chance to Hit: 1k km/s 79%   3k km/s 20%   5k km/s 15.8%   10k km/s 7.9%
Materials Required:    1.1x Tritanium   0.4876x Gallicite   Fuel x125

Your missile is still way out of line with your fire control. You have 20m km reach with the fire control, but 440m km reach with the missile. Reduce the endurance until you have 30m or so range (gives you a bit of wiggle room in engagements). Put the extra in engines and warhead.

Doing this increases the missile size above what my size 5 launcher can handle ill continue to play around with it but I cant seem to get the range down further than that.

I have Updated the OP with my new redesigned Ship

Thanks for the Advice Im glad to hear I at least got some bits right, ill get to work on your suggestions really helped alot thanks.

There is no real "right" answer. There are effective answers

Thanks for the Advice Im glad to hear I at least got some bits right, ill get to work on your suggestions really helped alot thanks.

Some things are very good here -- good range for an early ship, good maintenance life, good magazine size.
A few things I notice:  your Striker missile goes VERY slow, and flies up to 500 million kilometers, but you can't sight targets more than 10mkm away with your larger sensor.  You have two active sensors with the same resolution.  The MR5 does nothing for you.  You have a resolution 3 missile fire control... presumably intended for anti-fighter or anti-missile use, but you have no active scanner to detect these targets, nor are you carrying an anti-missile.  (This would usually be a size 1 or smaller, warhead 1 missile with very high speed.)  If you really want to use anti-missile missiles, you should have an active sensor and a missile fire control with resolution 1.  If you don't intend to shoot at fighters or missiles, then drop the second fire control.  (A second fire control with resolution 16-20, however can be useful for targeting FACs.)

So, my recommendations:
1. Design an active sensor with resolution 160.  Make it size 4 or more, and see what kind of range you can get from it.
2. Make a missile fire control, also resolution 160, and whatever size you need to have the same max range as your sensor.
3. Redesign your missile.  It should be about half engines (2.5MSP), and they should have the highest power multiplier you have the tech for.  Only add enough fuel to reach the maximum range of your sensor and fire control.  The rest of the MSP should be mostly warhead.  With a size 5 missile you should be able to get WH4 easily, and maybe WH9 (squares are best).  Only allocate agility points to round the missile out to size 5.
4. Repeat the above steps with a resolution 1 sensor if you want to carry anti-missiles.  The AMMs should be size 1, warhead 1, pretty short range, and lots of speed.